The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 1988
Filed:
Aug. 25, 1987
Raymond L Coleman, Cheshire, GB;
Era Patents Limited, , GB;
Abstract
In a method of testing electrical equipment having inherent stray impedances while the equipment is connected to a conductor a swept sinusoidal signal is injected and the response of the equipment to the signal analysed. In order to prevent current flow within the conductor affecting the results of the analysis a nulling signal is injected to nullify the current which would otherwise flow in the conductor as a result of the application of the swept-frequency signal. In a preferred embodiment the phase and amplitude of currents in the conductor and in the line through which nulling signals are injected are compared. The phase and amplitude of the nulling signal are adjusted in accordance with the result of these comparisons.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile